Door check and closer.



J. C. SCHMIDT.

nook cua-cx no ,cLosen APPLCHON FLD SEPT 7. Isl?. 1,266,864. PaIentPdMayZl, 1918.

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x11/NIEUW I. C. SCHMIDT.

DUUR CHECK AND CLOSER` APPucAmJN FILED sEPI. I. lan.

1,266,864. Patented Muy 21,1918.

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Speoioetion of Letters Patent.

Patented May 21, 1918.

Application iled September 7, 191'?. Serial No. 190,231.

To all whom, t may concern.'

Be it known that I Jol-INC. SCHMIDT, a citizen of the United States, and,a resident of Chicago, in the county of Cook and State of Illinois,have invented certain new and useful Improvements in Door Checks andClosers; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

his invention relates to improvements in door checks and c1osers,-oneobject of the invention being to provide an eflicient device of thischaracter in which the use of liquid and the disadvantages incidentthereto shall be avoided, and which shallV depend for its accuracy of oration upon pneumatic and friction brae means A further object is to soconstruct a door check offered to the opening movement of the door andwhich will permit full force of the strength of the spring during theclosing movement of the doo A further object is to so construct a doorcheck and closer employin pneumatic means that the vacuous conditionproduced will control the first half of the closing movement of thedoor, and so that the compression of air will control the other half.

A further object is to provide a door check and closer having pneumaticand friction brakemeans, in which compression. of air and vacuouscondition will control the a plication and release of the friction b edevices.

A further object is to provide simple and the parte to any desiposition.

With these and other obects in view, the invention consists in certainnovel features of construction and combinations of parts as hereinafterset forth and pointed out in the claims.

In the accompanying drawings; Fi 1 is a view in elevation of a door chand closer embod inp` mjy invention Fig. 2 is a top plan view of thesame; li`ig. 3 is a longitudinal sectional view; Fig. 4 is a bottom planview partly in section showing the positions of the parts when the dooris closed;'Fig. 5 is a similar view showing the positions of the partswhen the door is open;

hold the door in and closer that no resistance will beV n 1s mounte toengae of said blocks when the s ort shaft is turned nular A 9 are detailviews.

1 represents a casing provided with cylinders 2, 3, which are disposeddiametr-ically opposite each other and communicate with the interior ofsaid casing. v

A friction element is located within the casing 1 so as to coperate withthe wall thereof and is connected with and controlled by the operationof pistons 4, 5 in the respective cylinders 2, 3,-said friction elementbeing connected with said pistons by means of piston rods G, 7. Theplstons 4, 5 are provided with cheek valves 8 which operate to permitfree movement of the same in one direction and retarded movement in theother direction, and valves 9 are provided at the outer ends of thecylinders 2, 3

for regulating the de ree of compression in one of them and the egree ofexpansion or vacuum in the other.

In the present instance, the friction element above referred tocomprises a s lit or divided brake ring 10 brake band 1l to eng e theinner wall of the casing 1. Locat within the space formed by dividingthe brokering are two recessed blocks 12, 12. These blocks .are securedto the adjacent ends of the clutch ring and in effect, constitute partsof the same. A short shaft 13, mounted between the blocks 12, isprovided with laterally projecting lu 14, between which a roller 15 soas one or the other and thus o` erate to expand the brake ring and causerictional engagemen't of its band 11 with the inner wall o the casing 1.An arm or lever 16 is secured to one end of the short shaft 13 andprojects across the brake ri?, said leverbeing provided at its free enwith a wrist gin 17 towhich the two piston rods 6 and are pivotallyattached. t will be observed that with theconstrucf tion abovedescribed, the short shaft 13 with the roller 15 mounted thereonconstitute a crank on one end of the lever for expanding the clutch ringwhen said lever is moved. The clutch ring is disposed under ananshoulder 18 within the casing 1 and located within said brake rinlandsuitably inned thereto so as to turn erewith, is a. isk 19 from which aspindle 20, made. rigid provided wit a 'of t e door,-the valves in saidpistons Ving with the same, projects upwardly and .passes through anopening in a ca 21 on said casing. A ring 22 is locate within the casing1 an the wall of the casing is made with a slot 23 to receiveJ lugs atthe outer end of said spring. 'A sleeve or sprin winder 24 is mountedon*4 e spindle 20 an is provided with a slot 2 to receive lugsuon theinner end of the sprin The sleeve or winder 24 passes freely t rough thehole in the cap 21 and is provided at its upper end with a notched head26 to receive a pawl 27 mounted on a lever 28 secured to the upper endofr the spindle 20. An extensible arm ,29V is loosely coupled at one endto the lever 28an'dat its other end, this arm is loosely coupled to asuitable bracket 30 to be secured to the door frame.

It is apparent that when the door is o ened, motion will be impartedthrough t e lever 28 to the spindle 20 and the spring 22 to wind thelatter and tur-n the rake ring 10. The casing 1 is split as at 31, andthe adjacent edges are provided with perforated llugs 32-33 throu whicha bolt 34' passes. A portion of t is bolt may be contracted somewhat insize and is threaded to receive a nut '35 which bears a ainst the lug32. The larger portion of t e bolt is threaded and receives theinternally threaded head of a lever 36,-a suitable ring or washer 37being disposed between the lever head and the lug 32 on the casing. Aportion ofthe bolt 34 is flattened to receive a set screw 38 mounted inthe lug 33 to prevent movement of said bolt. The lever 36 may beprovided with a foot 39 to rest upon the casing when said lever is inits normal position. By turning the lever 36 on the threaded bolt 34,the casing will be contracted somewhat and caused to tightly clamp thebrake ring to lprevent the same from turning. The mechanism may belocked in this manner to prevent movement of the door and thus the doormay be held in any desired position. for wear between the band of thebrake ring and the casin the bolt 34 may be adjusted longitudine 1y.

In the o erationV of my improvements, no resistance is offered by themovements of the istons in the cylinders to the openiig eas to permitfree movement of said pistons during the opening movement of the door.The spring will be permitted to exert its full strength during theclosing movement of the door and this closring movement is controlledbiyL the automatic applicationand release of t e brake as effected by'the retardation and release of the pistons 1n the cylinders. L When thedoor is being o cned, the spring 22 will be wound and its orce will beapso arranged plied to cause the closing of the door when ment of thedoor 1s under the contro In order to compensateV the latter him beenreleased.' When the door is bein closed by the a plication of the forceo the spring 22, t e clutch ring 10 will be turned and power will be aplied to the pistons. At the beginning of t e closing movement of thedoor the pistons cannot move freel because a vacuous condition will b'ecreate in one of the cylinders and air willgbe compressed in the ot ercylinder. Such retardation of the movement of the pistons as compared tothe force of the spring 22 `tendin t e lever 16 to e turned slightly andits crank to expand the `clutch ring, as previously explained. Thisapplication of the ,brake will cause a retardation of the closreason ofthe vacuous condition created in the cylinder 2. As the door approachesits closed lposition, the patent compression of air int e cylinder 3will cause the final portion of the closin movement of the door to beretarded su ciently to prevent slamming.

From the above description, it will be seen that the first half of theclosing moveof the vacuous condition created in the cylinder 2; that thelast portion of such closing movement is under the control ofcompression of air in the cylinder 3, and that the varying resistanceoffered by the pistons will automatically control the application andrelease of the friction brake.

Having fully described my invention, what I claim as new and desire tosecure by Letters-Patent, is

1. In a door check and closer, the combination with a springactuatedmember, of a friction device connected therewith, and pneumatic meansfor controlling the application and release of said friction device.

2. In a door check and closer, the combination with a spring-actuatedmember, of a friction device connected therewith, a lever for operatingsaid friction device, and pneumatic means connected with said lever forcontrolling the automatic application and release of said frictiondevice.

3: In a door check and closer, the combination with a spring-actuatedmember, of a friction device connected therewith, operating means forsaid friction device, and pneumatic means connected with said operatingmeans for retardi-ng the movement of to move them, will cause the latterto effect the application of the friction device durin the initialclosing movement of the mec anism.

4. In a door check and closer, the combination with a spring-actuatedmember, of a friction device connected therewith, o eratin means forsaid friction device, a ining cy inders, 1plisltons in said cylinders,valves for contro g the movements of said pistons, and means connectingboth o f said pistons with said o erating means.

5. In a door c eck and closer, the combination with a spring-actuatedmember, of a friction device connected therewith, a cranked lever forexpanding said friction device, al' cylinders, pistons in saidcylinders, valv for contro in the movements of said pistons, and regsconnecting said istons with said cranked lever.

6. n a door check and closer, the combination with a casing, and a sring actuated member, of a s lit brake I'in ocated within said casing anconnected wlth said springactuated member, a lever mounted 1n the splitportion of said ring and having a crank disposed between the adjacentportions of said ring, alinin cylinders on the casin pistons in said cyinders, valves for contro?- ing the movements of said pistons andconnections between said pistons and said lever.

7 In a door check and closer, the combination with a casin and a springactuated member, of a s lit riction ring mounted in said casing anconnected with said springactuated member, a lever disposed across saidfriction ring and provided with a cranked portion mounted etween theadjacent ends of the split portion of the ring, and pneumatic means forcontrolling the 8. In a door check and closer, the combination with acasing, and a spring-actuated member, of a split friction ring coperablewith the wall of said casing and connected with said spring-actuatedmember, operating means for expanding said ring, and pneumatic meansconnected with said operating means for controlling the expansion ancontraction of said friction ring.

9. In a. door check and closer, the combination with a `casing and aspring-actuated member, of a split friction ring coperable with the wallof the casing and connected with said s ring-actuated member blockssecured to e adjacent ends of the split 'portion of the friction ring, ashort shaft mounted between said blocks, a roller carried by said shaftto engage said blocks, a lever secured to said shaft, and pneumaticmeans connected with said lever for controlling the expansion andcontraction of the friction ring.

10. In a door check and closer, the combination with a split casing aspring-actuated member, and a friction brake member cooperable with thewall of the casing, of means for tightening the casing on said frictionbrake member, and means for controllinthe operation of said brakemember.

testimony whereof, I have signed this specification in the presence oftwo subscribing witn ,W. R. BAUM,

Gnonen F. DowNnaG.

